Support network slicing permission check in multi-user environment

In multi-user environment, the App might not be installed by system user.
As a result, the ConnectivityService should use the packageManager from
the user's context to be able to read the property correctly.

Bug: 300274339
Test: TH
Change-Id: I5398c95562bcaf5752270b52f38cca1f02698ba1
1 file changed